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Ernests Gulbis claimed the biggest win of his career on Sunday as he stunned Roger Federer 6-7(5), 7-6(3), 6-2, 4-6, 6-3 to reach the Roland Garros quarter-finals.

"I'm clearly very disappointed not to come through with the win," said
Federer. "After the chance in the second set, fighting back in the
fourth, not to play a better fifth set. There are a lot of regrets here
now. But I think Gulbis did a good job of hanging around and clearly
coming back in that second set was crucial for him, I think. It was a
tough match and I'm disappointed I lost it."

"On my side, I wished I could have played a bit better. I feel I should
have done better from the baseline and I didn't really get into his
service games."

"It’s the biggest win of my career," Gulbis told Cedric Pioline
in an on-court interview. "Sorry I had to win. I know how everyone
likes Roger. It was a tough match but this is sport. I’ve been playing
very well in France. I won tournaments in Marseille and Nice, hopefully
Paris is the next one.

"For my confidence and just for me as a tennis player, a five-set win over Roger Federer, it's really big. Hopefully it's going to change me that I become more confident about myself, you know, on a tennis court."

The Latvian is through to his second Grand Slam quarter-final, with his first also coming at Roland Garros six years ago (l. to Djokovic). He will face Czech Tomas Berdych, against whom he has a 2-4 Head to Head record, losing their past two meetings.

Richard Gasquet, Sebastien Grosjean and 2003 champion Juan Carlos Ferrero watched on as victory for Gulbis ended Federer’s run of Roland Garros
quarter-final appearances at nine straight. The Swiss completed the
career Grand Slam when he lifted the trophy in Paris in 2009 (d.
Soderling).

It is only the third time in the past 40 majors that Federer has failed
to reach the quarter-finals, with the other two defeats coming last year
at Wimbledon (second round vs. Sergiy Stakhovsky) and the US Open (fourth round vs. Tommy Robredo).

Federer had the chance to take a commanding two-set lead over Gulbis,
but squandered a 40/15 advantage when serving at 5-3 as Gulbis fought
back to level the match.

''I was lucky, I have to say,'' Gulbis said about Federer's set point. "I was really lucky."

The 18th-seeded Latvian broke Federer twice to
take the third set but, after leaving the court before the start of the
fourth set, Federer came back re-focused and took the match to a
decider.

Gulbis went up an early break in the fifth set and afforded Federer no
opportunity to get back level. Gulbis held his nerve in the ninth game
and served out the match to 15, claiming victory in three hours and 42
minutes.

"The plan was to play more to his backhand and then with my backhand
down the line to go for down the line shots," said Gulbis. "That was the
main plan, to not go too much to his forehand, because he has the
nicest and the most dangerous forehand I think in the world.

"He's also a human being," said Gulbis. "I had more or less a clear game
plan. I had to play on his backhand and from the backhand he makes
these unforced errors. When it's a tight moment [at the start of the
fifth set], he's Roger Federer,
but he also gets tight. I remember actually he missed the forehand wide
when he was going for the shot, and that happens. He's probably going
to make seven out of 10. Other guys are going to make two out of 10.
Mistakes happen."

But he seemed uncertain about the veracity of Gulbis’s lengthy injury timeout
towards the end of the fourth set at 5-2 when Federer was about to serve, when he left the court to get
treatment.

"He didn’t look hurt in any way," said Federer. "They
leave the court, go for treatment and then come back. You don't know
what they were doing. So that's part of the game.

"But clearly you don't
want anybody to abuse it. I hope that Ernests didn't. As long as
integrity is fine and the players do it because of obvious reasons, it's
OK. But if it's just to disrupt play for the other guy, then clearly
it's not very fair."